To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below. TreatmentObservationA20302533B22262028C40302822 Note: rearrange this to (columns) in excel: A B C20 22 4030 26 3025 20 2833 28 22The mean square between treatments (MSTR) equals Group of answer choices5.861.8723634

To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below. TreatmentObservationA20302533B22262028C40302822 Note: rearrange this to (columns) in excel: A B C20 22 4030 26 3025 20 2833 28 22The null hypothesis is to be tested at the 1% level of significance. The critical value from the table is  Group of answer choices16.694.268.0299.39

o test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below. TreatmentObservationA20302533B22262028C40302822 Note: rearrange this to (columns) in excel: A B C20 22 4030 26 3025 20 2833 28 22The null hypothesis is to be tested at the 1% level of significance. The null hypothesis Group of answer choicesshould be revisedNo answer text provided.should not be rejectedshould be rejected

In a study, subjects are randomly assigned to one of three groups: control, experimental A or experimental B. After treatment, the mean scores for the three groups are compared. The appropriate statistical test for comparing these means is:

A cosmetic company wanted to demonstrate the benefit of using their skincare for dark skin treatments. A sample of six was obtained, and each participant used it for 30 days. After 30 days, the scores were as follows:ParticipantBefore treatmentAfter treatment117222161931921415175121861318Is there any significant difference after 30 days? Use α = 0.05.a.Use paired t-test and there is a difference after 30 days of treatment.b.Use ANOVA test and there is a difference after 30 days of treatment.c.Use Z-test and there is a difference after 30 days of treatment.d.Use 2-sample t-test and there is a difference after 30 days of treatment.

Assuming the experiment was balanced: the number of different treatments used in the experiment, and the number of subjects (separate observations) for each treatment wereGroup of answer choices5 subjects on each of 4 treatments5 subjects on each of five treatments6 subjects on each of 4 treatments6 subjects on each of 5 treatments30 subjects on each of 4 treatments